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# CPU usage of Performance Analysis Stealth Collector (91024)

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• ## Title

CPU usage of Performance Analysis Stealth Collector
• ## Description

How much CPU is used by the Performance Analysis Stealth Collector?

• ## Resolution

There is one collector per instance, and the threshold for CPU consumption per collector is 3%. Per each collector on the host, run top, see how much CPU is consumed for the quest_sc_collector process, and divide each CPU consumption per collector by the number of CPUs.

For example, if you have 2 collectors on one machine (meaning there are 2 instances that are monitored) and top shows 10% of CPU consumption per collector A and 34% of CPU consumption per collector B:

10%/20CPUs=0.5% CPU consumption per collector A
34%/20CPUs=1.7% CPU consumption per collector B

Total of CPU consumption by the Collectors from the entire system: 0.5% + 1.7% = 2.2%.

Another example:
Let’s say that each collector consumes as much as CPU as it allowed (threshold of 3%), then the two collectors will consume total of 6% CPU from the entire system.

In some cases, "top" is not a valid utility to monitor CPU usage by process on multicore systems. Then "ps -aux" would be a better option. Here is an example; ps -aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND ora 19425 0.0 4.1 144432 84480 ? S Feb04 22:52 StealthCollect@isrsol09-O102364@quest_sc_mw (PORT=7429) In this case we see that average CPU usage of MW process since start is 0%

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Product(s):
Performance Analysis for Oracle
7.0.1, 6.5.7, 6.5.5, 6.5.4.7, 6.5.4.5, 6.5.4, 6.5, 6.3, 7.0, 6.2, 6.1.113, 6.1
Topic(s):
Troubleshooting
Article History:
Created on: 4/11/2012
Last Update on: 5/7/2015
Author:
Yaser Cidic
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